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use {Error, Result};
use errno::Errno;
use libc::{timespec, time_t, c_int, c_long, uintptr_t};
use std::os::unix::io::RawFd;
pub use self::ffi::kevent as KEvent;
mod ffi {
pub use libc::{c_int, c_void, uintptr_t, intptr_t, timespec};
use super::{EventFilter, EventFlag, FilterFlag};
#[derive(Clone, Copy)]
#[repr(C)]
pub struct kevent {
pub ident: uintptr_t,
pub filter: EventFilter,
pub flags: EventFlag,
pub fflags: FilterFlag,
pub data: intptr_t,
pub udata: usize
}
#[allow(improper_ctypes)]
extern {
pub fn kqueue() -> c_int;
pub fn kevent(
kq: c_int,
changelist: *const kevent,
nchanges: c_int,
eventlist: *mut kevent,
nevents: c_int,
timeout: *const timespec) -> c_int;
}
}
#[repr(i16)]
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum EventFilter {
EVFILT_READ = -1,
EVFILT_WRITE = -2,
EVFILT_AIO = -3,
EVFILT_VNODE = -4,
EVFILT_PROC = -5,
EVFILT_SIGNAL = -6,
EVFILT_TIMER = -7,
EVFILT_MACHPORT = -8,
EVFILT_FS = -9,
EVFILT_USER = -10,
EVFILT_VM = -12,
EVFILT_SYSCOUNT = 13
}
bitflags!(
flags EventFlag: u16 {
const EV_ADD = 0x0001,
const EV_DELETE = 0x0002,
const EV_ENABLE = 0x0004,
const EV_DISABLE = 0x0008,
const EV_RECEIPT = 0x0040,
const EV_ONESHOT = 0x0010,
const EV_CLEAR = 0x0020,
const EV_DISPATCH = 0x0080,
const EV_SYSFLAGS = 0xF000,
const EV_FLAG0 = 0x1000,
const EV_FLAG1 = 0x2000,
const EV_EOF = 0x8000,
const EV_ERROR = 0x4000
}
);
bitflags!(
flags FilterFlag: u32 {
const NOTE_TRIGGER = 0x01000000,
const NOTE_FFNOP = 0x00000000,
const NOTE_FFAND = 0x40000000,
const NOTE_FFOR = 0x80000000,
const NOTE_FFCOPY = 0xc0000000,
const NOTE_FFCTRLMASK = 0xc0000000,
const NOTE_FFLAGSMASK = 0x00ffffff,
const NOTE_LOWAT = 0x00000001,
const NOTE_DELETE = 0x00000001,
const NOTE_WRITE = 0x00000002,
const NOTE_EXTEND = 0x00000004,
const NOTE_ATTRIB = 0x00000008,
const NOTE_LINK = 0x00000010,
const NOTE_RENAME = 0x00000020,
const NOTE_REVOKE = 0x00000040,
const NOTE_NONE = 0x00000080,
const NOTE_EXIT = 0x80000000,
const NOTE_FORK = 0x40000000,
const NOTE_EXEC = 0x20000000,
const NOTE_REAP = 0x10000000,
const NOTE_SIGNAL = 0x08000000,
const NOTE_EXITSTATUS = 0x04000000,
const NOTE_RESOURCEEND = 0x02000000,
const NOTE_APPACTIVE = 0x00800000,
const NOTE_APPBACKGROUND = 0x00400000,
const NOTE_APPNONUI = 0x00200000,
const NOTE_APPINACTIVE = 0x00100000,
const NOTE_APPALLSTATES = 0x00f00000,
const NOTE_PDATAMASK = 0x000fffff,
const NOTE_PCTRLMASK = 0xfff00000,
const NOTE_EXIT_REPARENTED = 0x00080000,
const NOTE_VM_PRESSURE = 0x80000000,
const NOTE_VM_PRESSURE_TERMINATE = 0x40000000,
const NOTE_VM_PRESSURE_SUDDEN_TERMINATE = 0x20000000,
const NOTE_VM_ERROR = 0x10000000,
const NOTE_SECONDS = 0x00000001,
const NOTE_USECONDS = 0x00000002,
const NOTE_NSECONDS = 0x00000004,
const NOTE_ABSOLUTE = 0x00000008,
const NOTE_TRACK = 0x00000001,
const NOTE_TRACKERR = 0x00000002,
const NOTE_CHILD = 0x00000004
}
);
pub const EV_POLL: EventFlag = EV_FLAG0;
pub const EV_OOBAND: EventFlag = EV_FLAG1;
pub fn kqueue() -> Result<RawFd> {
let res = unsafe { ffi::kqueue() };
if res < 0 {
return Err(Error::Sys(Errno::last()));
}
Ok(res)
}
pub fn kevent(kq: RawFd,
changelist: &[KEvent],
eventlist: &mut [KEvent],
timeout_ms: usize) -> Result<usize> {
let timeout = timespec {
tv_sec: (timeout_ms / 1000) as time_t,
tv_nsec: ((timeout_ms % 1000) * 1_000_000) as c_long
};
let res = unsafe {
ffi::kevent(
kq,
changelist.as_ptr(),
changelist.len() as c_int,
eventlist.as_mut_ptr(),
eventlist.len() as c_int,
&timeout as *const timespec)
};
if res < 0 {
return Err(Error::Sys(Errno::last()));
}
return Ok(res as usize)
}
#[inline]
pub fn ev_set(ev: &mut KEvent,
ident: usize,
filter: EventFilter,
flags: EventFlag,
fflags: FilterFlag,
udata: usize) {
ev.ident = ident as uintptr_t;
ev.filter = filter;
ev.flags = flags;
ev.fflags = fflags;
ev.data = 0;
ev.udata = udata;
}